Hikers in the interior of Galaxy cave on the Ben Dang River in Thien Ha, Ninh Binh, Vietnam, Indochina, Southeast Asia, Asia

photography colour colour image color color image horizontal horizontal image two people male men asian appearance 25 29 years 55 59 years travel travel destination travel destinations underground hikers galaxy cave ben dang river thien ha ninh binh vietnam indochina southeast asia south east asia southeast asian south east asian asia asian geological feature rock rock formation illuminated lit lit up subterranean cavern adventure the great outdoors cave caver x 2018m2 x printready